/*
 * Created on Feb 28, 2005
 * Created by Alon Rohter
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package org.gudy.azureus2.plugins.messaging.bittorrent;

import java.nio.ByteBuffer;

import org.gudy.azureus2.core3.util.DirectByteBuffer;
import org.gudy.azureus2.plugins.messaging.Message;
import org.gudy.azureus2.pluginsimpl.local.messaging.MessageAdapter;

import com.aelitis.azureus.core.peermanager.messaging.bittorrent.BTCancel;
import com.aelitis.azureus.core.peermanager.messaging.bittorrent.BTMessage;
import com.aelitis.azureus.core.peermanager.messaging.bittorrent.BTPiece;
import com.aelitis.azureus.core.peermanager.messaging.bittorrent.BTRequest;

/**
 *
 */
public class BTMessageManager {

    public static final String ID_BTMESSAGE_REQUEST = BTMessage.ID_BT_REQUEST;
    public static final String ID_BTMESSAGE_CANCEL = BTMessage.ID_BT_CANCEL;
    public static final String ID_BTMESSAGE_PIECE = BTMessage.ID_BT_PIECE;
    public static final String ID_BTMESSAGE_UNCHOKE = BTMessage.ID_BT_UNCHOKE;

    /**
     * Translate the given core-made BT Request message into a specific plugin message adaptation.
     * 
     * @param core_made_message
     *            to translate
     * @return adapted plugin message
     */
    public static BTMessageRequest createCoreBTRequestAdaptation(Message core_made_message) {
        // the message was originally created by core and wrapped
        com.aelitis.azureus.core.peermanager.messaging.Message core_msg = ((MessageAdapter) core_made_message).getCoreMessage();

        if (core_msg.getID().equals(BTMessage.ID_BT_REQUEST)) {
            return new BTMessageRequest(core_msg);
        }

        return null;
    }

    /**
     * Translate the given core-made BT Cancel message into a specific plugin message adaptation.
     * 
     * @param core_made_message
     *            to translate
     * @return adapted plugin message
     */
    public static BTMessageCancel createCoreBTCancelAdaptation(Message core_made_message) {
        // the message was originally created by core and wrapped
        com.aelitis.azureus.core.peermanager.messaging.Message core_msg = ((MessageAdapter) core_made_message).getCoreMessage();

        if (core_msg.getID().equals(BTMessage.ID_BT_CANCEL)) {
            return new BTMessageCancel(core_msg);
        }

        return null;
    }

    /**
     * Translate the given core-made BT Piece message into a specific plugin message adaptation.
     * 
     * @param core_made_message
     *            to translate
     * @return adapted plugin message
     */
    public static BTMessagePiece createCoreBTPieceAdaptation(Message core_made_message) {
        // the message was originally created by core and wrapped
        com.aelitis.azureus.core.peermanager.messaging.Message core_msg = ((MessageAdapter) core_made_message).getCoreMessage();

        if (core_msg.getID().equals(BTMessage.ID_BT_PIECE)) {
            return new BTMessagePiece(core_msg);
        }

        return null;
    }

    public static MessageAdapter wrapCoreMessage(BTMessage core_msg) {
        String id = core_msg.getID();

        if (id.equals(BTMessage.ID_BT_REQUEST)) {

            return new BTMessageRequest(core_msg);

        } else if (id.equals(BTMessage.ID_BT_CANCEL)) {

            return new BTMessageCancel(core_msg);

        } else if (id.equals(BTMessage.ID_BT_PIECE)) {

            return new BTMessagePiece(core_msg);

        } else {

            return (new MessageAdapter(core_msg));
        }
    }

    /**
     * Create a core BT Request message instance.
     * 
     * @param piece_number
     * @param piece_offset
     * @param length
     * @return core message wrapped in an adapter
     */
    public static Message createCoreBTRequest(int piece_number, int piece_offset, int length) {
        return new MessageAdapter(new BTRequest(piece_number, piece_offset, length, (byte) 1));
    }

    /**
     * Create a core BT Cancel message instance.
     * 
     * @param piece_number
     * @param piece_offset
     * @param length
     * @return core message wrapped in an adapter
     */
    public static Message createCoreBTCancel(int piece_number, int piece_offset, int length) {
        return new MessageAdapter(new BTCancel(piece_number, piece_offset, length, (byte) 1));
    }

    /**
     * Create a core BT Piece message instance.
     * 
     * @param piece_number
     * @param piece_offset
     * @param data
     * @return core message wrapped in an adapter
     */
    public static Message createCoreBTPiece(int piece_number, int piece_offset, ByteBuffer data) {
        return new MessageAdapter(new BTPiece(piece_number, piece_offset, new DirectByteBuffer(data), (byte) 1));
    }

}
